Ok I know you will have been asked this before but I am beside myself after 2 days trying to fix this.
I have a new computer and no longer have access to the old one. My Sony e-book is readable and I can read stuff on the Digital Editions and the Sony library. BUT I can not move a book from either the library or Editions. Both are telling me that the computer is not authorised.
I have unauthorised and reauthorised all with support from Adobe and still not joy.
I really do want to fix this and even have un installed both programs and re installed them but still no joy